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Abstract:

A micro projection device includes a light-emitting unit, a first lens
unit, a reflective unit, a second lens unit, a prism unit, an image
display unit and a projection unit. The light-emitting unit has three
light-emitting modules. Each light-emitting module has a heat-dissipating
element, a light-emitting element and a light-guiding element combined
with the heat-dissipating element for receiving light beams generated by
the light-emitting element. The first lens unit has three first lens sets
respectively disposed beside the three light-emitting modules. The
reflective unit is disposed beside the first lens unit. The second lens
unit is disposed beside the reflective unit. The prism unit is disposed
beside the second lens unit. The image display unit has a reflective
image display panel disposed beside one side of the prism unit. The
projection unit has a projection lens disposed beside another side of the
prism unit.

Claims:

1. A micro projection device for simplifying optical component and
increasing light-guiding precision, comprising: a light-emitting unit
having at least three light-emitting modules, wherein each light-emitting
module has at least one heat-dissipating element, at least one
light-emitting element disposed on the at least one heat-dissipating
element and at least one light-guiding element combined with the at least
one heat-dissipating element for receiving light beams generated by the
at least one light-emitting element; a first lens unit having at least
three first lens sets respectively disposed beside sides of the at least
three light-emitting modules; a reflective unit disposed beside one side
of the first lens unit; a second lens unit disposed beside one side of
the reflective unit; a prism unit disposed beside one side of the second
lens unit; an image display unit having at least one reflective image
display panel disposed beside one side of the prism unit; and a
projection unit having at least one projection lens disposed beside
another side of the prism unit.

2. The micro projection device as claimed in claim 1, wherein the at
least three light-emitting elements are a red LED, a green LED and a blue
LED, respectively.

3. The micro projection device as claimed in claim 1, wherein each
light-emitting element has a circuit substrate and an LED chip disposed
on and electrically connected to the circuit substrate.

4. The micro projection device as claimed in claim 1, wherein each
heat-dissipating element has a heat-dissipating substrate and a plurality
of heat-dissipating fins extended downwards from a bottom side of the
heat-dissipating substrate.

5. The micro projection device as claimed in claim 1, wherein each
light-guiding element has an end portion contacting a top surface of each
heat-dissipating element and covering each light-emitting element.

6. The micro projection device as claimed in claim 1, wherein the
reflective unit has at least two reflective elements, one of the at least
two reflective elements is disposed beside one side of one of the at
least three first lens sets, and other reflective element is disposed
between other two first lens sets that share the other reflective
element.

7. The micro projection device as claimed in claim 1, wherein the
reflective unit has at least one reflective element disposed between the
at least three first lens sets, and the at least three first lens sets
share the at least one reflective element.

8. The micro projection device as claimed in claim 1, wherein the second
lens unit has at least one second lens set disposed between the
reflective unit and the prism unit.

9. The micro projection device as claimed in claim 1, wherein the prism
unit is a polarizing beam splitting element, and the at least one
reflective image display panel is an LCOS panel.

10. The micro projection device as claimed in claim 1, wherein the prism
unit is a prism set composed of a plurality of prisms, and the at least
one reflective image display panel is a DLP panel.

11. A micro projection device for simplifying optical component and
increasing light-guiding precision, comprising: a light-emitting unit
having at least three light-emitting modules, wherein each light-emitting
module has at least one heat-dissipating element, at least one
light-emitting element disposed on the at least one heat-dissipating
element and at least one light-guiding element combined with the at least
one light-emitting element for receiving light beams generated by the at
least one light-emitting element; a first lens unit having at least three
first lens sets respectively disposed beside sides of the at least three
light-emitting modules; a reflective unit disposed beside one side of the
first lens unit; a second lens unit disposed beside one side of the
reflective unit; a prism unit disposed beside one side of the second lens
unit; an image display unit having at least one reflective image display
panel disposed beside one side of the prism unit; and a projection unit
having at least one projection lens disposed beside another side of the
prism unit.

12. The micro projection device as claimed in claim 11, wherein the at
least three light-emitting elements are a red LED, a green LED and a blue
LED, respectively.

13. The micro projection device as claimed in claim 11, wherein each
light-emitting element has a circuit substrate and an LED chip disposed
on and electrically connected to the circuit substrate.

14. The micro projection device as claimed in claim 13, wherein each
light-guiding element has an end portion contacting a top surface of the
circuit substrate of each light-emitting element and covering each
light-emitting element.

15. The micro projection device as claimed in claim 11, wherein each
heat-dissipating element has a heat-dissipating substrate and a plurality
of heat-dissipating fins extended downwards from a bottom side of the
heat-dissipating substrate.

16. The micro projection device as claimed in claim 11, wherein the
reflective unit has at least two reflective elements, one of the at least
two reflective elements is disposed beside one side of one of the at
least three first lens sets, and other reflective element is disposed
between other two first lens sets that share the other reflective
element.

17. The micro projection device as claimed in claim 11, wherein the
reflective unit has at least one reflective element disposed between the
at least three first lens sets, and the at least three first lens sets
share the at least one reflective element.

18. The micro projection device as claimed in claim 11, wherein the
second lens unit has at least one second lens set disposed between the
reflective unit and the prism unit.

19. The micro projection device as claimed in claim 11, wherein the prism
unit is a polarizing beam splitting element, and the at least one
reflective image display panel is an LCOS panel.

20. The micro projection device as claimed in claim 11, wherein the prism
unit is a prism set composed of a plurality of prisms, and the at least
one reflective image display panel is a DLP panel.

Description:

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a micro projection device, and
more particularly, to a micro projection device for simplifying optical
component and increasing light-guiding precision.

[0003] 2. Description of Related Art

[0004] Due to the development of optical and projection display
technology, digital projection devices with a high number of dots per
inch and pixels are often used for briefings, meetings, conferences or
trainings. They have also become an important apparatus for family
entertainment. Such potential consumers look for a lightweight digital
projection apparatuses with high image quality and brightness, all at, of
course, a reasonable price.

[0005] A projector is an apparatus for projecting images onto a large size
screen by optical projection. A projector can be substantially classified
into four types, CRT projector, liquid crystal display (LCD) projector,
digital light processing (DLP) projector, and liquid crystal on silicon
(LCOS) projector, depending on which light valve is adopted. The LCD
projector is a transmission projector for its perviousness to light, and
LCOS, DLP projectors are reflection projectors because they form images
relying on light reflection.

[0006] The LCOS projector and the LCD projector are based on similar
principles, but the LCOS projector modulates light signals emitted from a
light source to a screen by an LCOS panel. In fabricating the LCOS panel,
CMOS wafer is adopted as a circuit substrate and a reflection layer.
Following that, a liquid crystal layer is coated and packed with a glass
panel. Since a reflection structure is adopted in the LCOS projector,
light signals emitted from the light source do not pass through the LCOS
panel. As a result, the LCOS projector is a reflection projector. On the
contrary, in an LCD projector, the light source is mounted behind the LCD
panel, and light signals pass through the LCD panel. Therefore, the LCD
projector is a transmission projector.

[0007] However, in the prior art, the optical components assembled in
traditional projector are complex no matter whether the LCD panel or the
LCOS panel is adopted. Hence, the optical path and the size of the
traditional projector can not be effectively reduced. Besides, the
traditional projector uses a single light pipe to integrate optical path,
so that the optical path tolerance of the traditional projector is
increased.

SUMMARY OF THE INVENTION

[0008] One particular aspect of the present invention is to provide a
micro projection device for simplifying optical component and increasing
light-guiding precision, so that the questions of using complex optical
components to increase the size and using the single light pipe to
generate large optical path tolerance in the prior art can be effectively
solved by the micro projection device in the present invention.

[0009] In order to achieve the above-mentioned aspects, the present
invention provides a micro projection device for simplifying optical
component and increasing light-guiding precision, including: a
light-emitting unit, a first lens unit, a reflective unit, a second lens
unit, a prism unit, an image display unit and a projection unit. The
light-emitting unit has at least three light-emitting modules. Each
light-emitting module has at least one heat-dissipating element, at least
one light-emitting element disposed on the at least one heat-dissipating
element and at least one light-guiding element combined with the at least
one heat-dissipating element for receiving light beams generated by the
at least one light-emitting element. The first lens unit has at least
three first lens sets, and the three first lens sets are respectively
disposed beside sides of the at least three light-emitting modules. The
reflective unit is disposed beside one side of the first lens unit. The
second lens unit is disposed beside one side of the reflective unit. The
prism unit is disposed beside one side of the second lens unit. The image
display unit has at least one reflective image display panel disposed
beside one side of the prism unit. The projection unit has at least one
projection lens disposed beside another side of the prism unit.

[0010] In order to achieve the above-mentioned aspects, the present
invention provides a micro projection device for simplifying optical
component and increasing light-guiding precision, including: a
light-emitting unit, a first lens unit, a reflective unit, a second lens
unit, a prism unit, an image display unit and a projection unit. The
light-emitting unit has at least three light-emitting modules. Each
light-emitting module has at least one heat-dissipating element, at least
one light-emitting element disposed on the at least one heat-dissipating
element and at least one light-guiding element combined with the at least
one light-emitting element for receiving light beams generated by the at
least one light-emitting element. The first lens unit has at least three
first lens sets, and the three first lens sets are respectively disposed
beside sides of the at least three light-emitting modules. The reflective
unit is disposed beside one side of the first lens unit. The second lens
unit is disposed beside one side of the reflective unit. The prism unit
is disposed beside one side of the second lens unit. The image display
unit has at least one reflective image display panel disposed beside one
side of the prism unit. The projection unit has at least one projection
lens disposed beside another side of the prism unit.

[0011] Therefore, because the at least one light-guiding element
alternatively combines with the at least one heat-dissipating element or
the at least one light-emitting element for receiving light beams
generated by the at least one light-emitting element, each single
light-guiding element can mate with each single heat-dissipating element
or each single light-emitting element in order to simplify optical
component, shorten optical path, decrease optical path tolerance,
increase light-guiding precision and so on.

[0012] In order to further understand the techniques, means and effects
the present invention takes for achieving the prescribed objectives, the
following detailed descriptions and appended drawings are hereby
referred, such that, through which, the purposes, features and aspects of
the present invention can be thoroughly and concretely appreciated;
however, the appended drawings are provided solely for reference and
illustration, without any intention that they be used for limiting the
present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a schematic view of the micro projection device according
to the first embodiment of the present invention;

[0014]FIG. 2 is a schematic view of the micro projection device according
to the second embodiment of the present invention;

[0015] FIG. 3 is a partial, schematic view of the micro projection device
according to the third embodiment of the present invention; and

[0016] FIG. 4 is a schematic view of the light-emitting unit of the micro
projection device according to the fourth embodiment of the present
invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Referring to FIG. 1, the first embodiment of the present invention
provides a micro projection device for simplifying optical component and
increasing light-guiding precision, including: a light-emitting unit 1, a
first lens unit 2, a reflective unit 3, a second lens unit 4, a prism
unit 5, an image display unit 6 and a projection unit 7.

[0018] The light-emitting unit 1 has at least three light-emitting modules
10. Each light-emitting module 10 has at least one heat-dissipating
element 100, at least one light-emitting element 101 disposed on the at
least one heat-dissipating element 100 and at least one light-guiding
element 102 combined with the at least one heat-dissipating element 100
for receiving light beams L generated by the at least one light-emitting
element 101.

[0019] For example, the at least three light-emitting elements 101 are a
red LED, a green LED and a blue LED, respectively. Hence, the
light-emitting unit 1 can generate red, green and blue light at the same
time. In addition, each heat-dissipating element 100 has a
heat-dissipating substrate H and a plurality of heat-dissipating fins F
extended downwards from a bottom side of the heat-dissipating substrate
H. Each light-emitting element 101 has a circuit substrate S and an LED
chip C disposed on and electrically connected to the circuit substrate S.
The LED chips C may be a red LED chip, a green LED chip and a blue LED
chip. Moreover, each light-guiding element 102 has an end portion
contacting a top surface of each heat-dissipating element 100 and
covering each light-emitting element 101. In other words, each
light-guiding element 102 and each heat-dissipating element 100 are
combined together to form a single piece component in order to decrease
optical path tolerance and increase light-guiding precision.

[0020] Furthermore, the first lens unit 2 has at least three first lens
sets 20, and the three first lens sets 20 are respectively disposed
beside sides of the at least three light-emitting modules 10. For
example, each first lens set 20 has at least two lenses 200 mated with
each other for receiving the light beams L that are projected from each
light-guiding element 102.

[0021] Besides, the reflective unit 3 is disposed beside one side of the
first lens unit 2. For example, the reflective unit 3 has at least two
reflective elements 30, one of the at least two reflective elements 30 is
disposed beside one side of one of the at least three first lens sets 20,
and other reflective element 30 is disposed between other two first lens
sets 20 that share the other reflective element 30.

[0022] In addition, the second lens unit 4 is disposed beside one side of
the reflective unit 3. For example, the second lens unit 4 has at least
one second lens set 40 disposed between one reflective element 30 of the
reflective unit 3 and the prism unit 5.

[0023] Moreover, the prism unit 5 is disposed beside one side of the
second lens unit 4. The image display unit 6 has at least one reflective
image display panel 60 disposed beside one side of the prism unit 5 and
the projection unit 7 has at least one projection lens 70 disposed beside
another side of the prism unit 5, so that the reflective image display
panel 60 and the projection lens 70 are respectively disposed beside two
opposite sides of the prism unit 5. For example, the prism unit 5 may be
a polarizing beam splitting element, and the at least one reflective
image display panel 60 may be an LCOS panel.

[0024] Referring to FIG. 2, the second embodiment of the present invention
provides a micro projection device for simplifying optical component and
increasing light-guiding precision, including: a light-emitting unit 1, a
first lens unit 2, a reflective unit 3, a second lens unit 4, a prism
unit 5, an image display unit 6 and a projection unit 7. The difference
between the second embodiment and the first embodiment is that: in the
second embodiment, the prism unit 5 may be a prism set that is composed
of a plurality of prisms 50, and the at least one reflective image
display panel 60 may be a DLP panel.

[0025] Referring to FIG. 3, the third embodiment of the present invention
provides a micro projection device for simplifying optical component and
increasing light-guiding precision. In the third embodiment, the
reflective unit 3 has at least one reflective element 30 disposed between
the at least three first lens sets 20, and the at least three first lens
sets 20 share the at least one reflective element 30.

[0026] FIG. 4 shows a schematic view of the light-emitting unit according
to the fourth embodiment of the present invention. Each light-emitting
module 10 has at least one heat-dissipating element 100, at least one
light-emitting element 101 disposed on the at least one heat-dissipating
element 100 and at least one light-guiding element 102 combined with the
at least one light-emitting element 101 for receiving light beams L
generated by the at least one light-emitting element 101. In addition,
each light-guiding element 102 has an end portion contacting a top
surface of the circuit substrate S of each light-emitting element 101 and
covering each light-emitting element 101. In other words, each
light-guiding element 102 and each light-emitting element 101 are
combined together to form a single piece component in order to decrease
optical path tolerance and increase light-guiding precision.

[0027] In conclusion, because the at least one light-guiding element
alternatively combines with the at least one heat-dissipating element or
the at least one light-emitting element for receiving light beams
generated by the at least one light-emitting element, each single
light-guiding element can mate with each single heat-dissipating element
or each single light-emitting element in order to simplify optical
component, shorten optical path, decrease optical path tolerance,
increase light-guiding precision and so on.

[0028] The above-mentioned descriptions merely represent solely the
preferred embodiments of the present invention, without any intention or
ability to limit the scope of the present invention which is fully
described only within the following claims. Various equivalent changes,
alterations or modifications based on the claims of present invention are
all, consequently, viewed as being embraced by the scope of the present
invention.